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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096f836b720a4b3b802173949a388d1d296f590fbfef1d7ab4dd39db946da015' 
  AND token = 'LiOUK6WBSv/jyddWyNflsukRhdnBqIo16qOJFPOLveA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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