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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4490f8655946fd1d6666675ac933aeef45b6f0f0d426a64cd75fe6160aec9ae' 
  AND token = 'RrwU/x29uiq1cAjMGSn1sPLwmXts2D519yoQnStz5hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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