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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567907ed48723e67792125c1d1e435df79baa8ea73d690c9e865737c853aa746' 
  AND token = 'dfAnj6o8jyuxrhYGE7YheNztT086L/5ILAC9CtlFKe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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