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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad37469389101e33e56b9686608b06fbb770f7db2c893b68ee348020a13021ac' 
  AND token = '0X11RDR1jOACQDksSDzG4exGgJ7irQWd9UbsuhvbEW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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