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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47384ee323e9d56d2fc800178240304e30f840bcafff66767de42d6c468c4497' 
  AND token = 'lfbx8OZMEYAtbrybYHNs0wid0r88cBJYpJo8gNjsqtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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