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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d613ace38a268ba96c16c6bcbe7849e7c83219c97cba0bbb3a83375d7321c3' 
  AND token = 'hVlYCCxT/t/LXew4VQ0vl14gLUt1jNmnL47ywTkpO8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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