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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b845794769d0f7a70c63f0b07176ef4cfaa905cedb2b81273268fa55e18b6cb' 
  AND token = 'xL0zxP9oiY1eFmR4ikshABVEyQWh6i4UF36x6VsxTus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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