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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02d6fed8c3944be407d914d6fc1b5f22d60f8a5d90adb9de1a9308b44d411e9' 
  AND token = 'f/AnzkPUeMoDaW83x1/B6T23CedQbbvWVU4DwctJbSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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