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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ffa37ab7dda6faf9ef0ac67a21d39c6b8674bd148e9443f37c02407007730cb' 
  AND token = '4y1y5MElAGF1MhRoadlrBPKjhEF+Nz52OAgar8tN0wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}