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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3288abe6d9bb20bc70076d8b89c2e759e281b56d90691a359a5a19bc402b0d9f' 
  AND token = 'WXhT67Zv9Hj6ma7rb31cWFoEauyUr2CcLgBQHyf1QTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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