Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c492d8048735378be260c88b1ccee158185c98b732f7c68597fcc8458d587b98' 
  AND token = '+JE4TRYM1RWhajtUlKYXd8MqqzL9OFCa38pT7DWZS0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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