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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac7d468a7faa8a4f546949898260e23909338d9db88f04b8eaff45db450c4c1' 
  AND token = '0Zu9XN2exoPyFl4V/yQdjTQWORU5NM07AayOEsZDAYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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