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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26035ed695f114922860bf7e81b8dbf5d08e36e324ee69736cffa58a5bbe56d' 
  AND token = '6PMRpBwGCB/F5d02MK2O85H9gUyCNvtI47G6QS7KAYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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