SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c226368c5087f138c6aa8ecae53c4df7e024b3e1927646e87b0097796664308' 
  AND token = 'Tv3zZpl6JbdqSXqyf1v7FpSwVmH3jYP7PKKLWB5qPL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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