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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cd9eb678d25b833caf10ad4f3bbf0f2bb56f9d40df9bd7b9c3362a71626df5' 
  AND token = 'lKaXdDIhRz0p+U9STC3RE+Vl2/i0cUA74DqyAzrMndk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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