Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9599b3948038b920fcf328f8e09c76c155ea676b14d137bafabba11bccdca0c' 
  AND token = 'AyIC3MVhLsgSVCuJm5fYsMrSUq3tEBIC0ky4kCv+NOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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