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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cc60349f0c828eed97352b91490d5a29207e717311b20b98a75d03d546d61a' 
  AND token = 'XF2aK19M26XxdnGfqt8ZkzNTnkGcl0BD1lfDO2tqPcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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