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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6cc95b9f6e95b75d2f483625b2013e3bfa9e27954b278d0cb34f27db4b86ae' 
  AND token = 'NNCSgjRXYOgwtGpJYt3PjAW0MteAfJOkUvS7YF1ad60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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