Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2591bd0ed0a65b4f5e4fad72dfe25dd0af7e57e3d78ea8539d0ffd6de11c34e1' 
  AND token = 'fpPb2DdLE+nxLNo/gvtO0qosvrMjvHQJxdimPRpQQNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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