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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823999733092a64c97ecbe481866b0c485beb7abeb7e17c81f4d8b3277697a86' 
  AND token = 'ShLkU/Gg1hev5CIWt8R0sDLHl24nybwg47EbwmDpTcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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