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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b2ea400b61f4fb3de5fbacefcd167f7ca5ccc7ec1e68be323f5387aa9ac628' 
  AND token = 'r08Q+ckLApFe+KkA705zmF0eb938DdSQg66pv5+IAw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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