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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd5b18116236b25c31cdd007e0ee020071909bc12b180d4690aa80275e08a43' 
  AND token = 'iZnMk0T3WxECvhWoPR0P9r13k0ZJogV/47Us8qchEFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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