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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5336a2c38fdbeb14f87d998531110e7842ea84bfd399ecc6c2fa8b16685e7cd' 
  AND token = '7Ioqa0c1Ido/0hY071JP2bME5u4wqpW14rXIbkFFv4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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