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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f30958ddebbb16a80f58d77338d44a088ca1704daf737d3cac9ca47759752c7' 
  AND token = 'S6BQ78bvBtC86Ziyaeun5KzqPI0lDJoEjBRw5UVA5uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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