Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e535f05b80a950956b73ac568d32dab6519a8cef26b19a7da25ade9745d39bdc' 
  AND token = 'YO/Ds7bko7HJxl0oXcnZMZ3GpZOnwdi4ZVOpfqXLxoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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