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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9df8d2ef853c12090d19889ea7556b56260c92fbb674901f01912a70f7fe701' 
  AND token = '2qOnptBMAc+Jza5j7io0EZJbFGkXbPysmKvbi2JkeAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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