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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019e05f891ffab04047e18e9b5fd97e45907ee060a20297fb9160d702110b9fe' 
  AND token = 'ZrzpWdqf6viUWxhNRnfQcnj0oYD1DVmkH5skx07JpKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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