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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb34f83dd8e394f8dc5340f53e486c4edd688284e8997df8c0a1e88cedfeab4' 
  AND token = 'BGJYFcUR5JEwVw+CHNMbWYlUZ4OU+SUfMvVlrQO9hFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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