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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62a61b9eddd69c0397b50a3b39981565cd7413da567c05ae91c8f68b7862a17' 
  AND token = 'Ia2nxdnht6VE+jh8htQF4dyrl/ZC39kiBfKSlVpKSpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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