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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '859ad117781d27db1cc14ac0abce6386b5ba322c782b7ebe8f4473f41c4e39d3' 
  AND token = 'GxBqeqJSb9lR9Kf0eU5uGg6BdFQxQ22vdzDjiTpwzUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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