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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35db8c3d5f68c9f97b9d91ddb13190f10ea2f73ade2e316c9cfa12e68f11b63c' 
  AND token = 'N0FBHHS82M8gCBWM8tWHzjHHPr3pe3oB2B0WW2tLajU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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