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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087e38242f797f5397e87ab2b59adb0cea285b5bb46b7f2ee000dc7001e700a9' 
  AND token = 'd1AHqt/Q/+OocPjfwGa5BQjKVWB8a4D3j3KLVdUT264=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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