SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60acd9ee77c6e2ac74aec966b60094f52022653816677bed756f29a8aa391fed' 
  AND token = '/H7ssJCpCKiSjcMvCxLg56Z/hQ9Btm4WgvhtPizhj5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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