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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd8634689f4168440522ecdfbdc39b45f2bebbebdc4b5dd3e0e6cd752b01dec' 
  AND token = 'cZ9Xghesgl0JEPae9L2Auj3j2xwZIzSbjsSvuT4/qL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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