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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab47a85d55651c8ad8a0937e95541caf5d95f52ad60c8d25595cbbe6be86acb7' 
  AND token = '+Z1C5kaMjUSSa+f/CbgrADl4H1gi8AvR6dRHqQy0ovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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