Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52983c9470dcfa0e78bb99cf431dae5b1a2c6a0802d5bfbda5bfa2e41d4c058e' 
  AND token = 'XHxj41hdmb9fTZ99Sf99LcZ+ZgBYCkLzruOZ2RVNYxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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