SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365c541ef71151e2a852f9a3fd9ae8e4e23f63843a0f4b81d447450805e49009' 
  AND token = 'Y1TYZjvljZEn0Sa2kpBWmhh1GRuk+VcLYc8khLJ/q0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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