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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088676d443ee8f52397f9d9b21c18f98a2a2f645d60a257252316b871f7a7370' 
  AND token = '7ez/BrwP2WsGihetLZZfI+rH2zaT0mRM1RPhXv4fdNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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