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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e237e81868999ca6d1a6c49a6d4ebd04921afe0975d76b9e4300a06d9bf17b' 
  AND token = 'tOkSaQmKpIWhjnmpG2DS7xpKV9b9wNjq3K1IjX7u6ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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