Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f0cf9ae4610e03fcbfa7759f7d374508d18c4a8de3c38fc3dfdc48e6deb44e' 
  AND token = '+2lNXglRFfCPGB1tTlmMCaYF1Gy4GzVv0mO/BSXZRr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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