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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1c867cdbe4ae7c263923d0e54b9af8170eb82ce95554efa11ba252ebf0146a' 
  AND token = 'UbVUGIve5jeUytqKfEGPnxEgNcjSXXRFI9YYb0rAjjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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