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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd011af56ca989976619fa34d75828f8feeaa8bc44d21cfe5fabab5bd5e54e428' 
  AND token = 'ZrjbHLA6pnC4TVHuyffiTTbfSzzreyy8k5icNyAbwbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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