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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9b50b000e2ddd54fb6d5744baf98a091420efc9f3027ab67ced72e92d212c3' 
  AND token = 'W9Ny3ZbBVjsqTIoRUSc8Fe2a8rJC64KH6dXHvABgT+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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