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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97f4f45ca60e7167a7912f33447ba37cc5f18ac4cad93ffac323632b32071ea' 
  AND token = 'kNj5964b9p7OEo5jng5I9uHGjk/+5NVdheyhEIJf8ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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