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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef7742292fa94c0c350ffb34f9d487d341e687f72c49d4de99ed0f70a522d30' 
  AND token = '4r9l3emzax8UoI5zLeXGZ3lUFoCd/vv/Me6YGeSmmTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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