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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60819376e1042049c2b974154b5d22f4245d1ee0971284f06a7b80eee918513' 
  AND token = '/6ClpEx2y/lAFYHm5wOne0pXeMlTce5zBODjKRmTLv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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