SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae3d7e8f30e391509c151183870866451ce41201b2f26859e3c3d4d37b0e143' 
  AND token = '8lUjGzG6vHVM+ZVKM5O7+q+/+BpXUzEnBtUs4zB3tKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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