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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db8d12ef0ae9bb5354cfd152cc58c88c56f6a57fcc342fbe3a413072b6ea589' 
  AND token = 'skMzIoXkXa6kFwW7ag7VweSaM1YZjlL8RJQ4If6WvG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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