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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c324374a65b27a743aa95ccb7d7df9b00e304fc105d2c16ddbf21767fcac93' 
  AND token = 'xdYKtwp9MVuH03pzcSJUyKtwzTkwAba6Kt59A7Ad8m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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