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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893bea1b6c4ce9bae14c91f47c5401a8042de6af4fa01f427a4b9c1f879a7d19' 
  AND token = 'CSIssT9flF/80ABT/51RpbockoOIgQ7g/lKtpHbCRK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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