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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17ebff9c59d20389c2c92e93c7e62d7117ef4540caabd4f9ff606be990fddc8' 
  AND token = 'lKiT+pIxpsX6pRCdtQQFJWIQUR4UEOl7zD/hNPGEs18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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