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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecabc8cf0e17bce6e959f97140edb7e655a433d412f31a7ff0c85497042659a4' 
  AND token = 'nh3i94HL/B9kk4EIXYkQWdaO2wyrBD5dqoFe6Jc8WYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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