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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f69fc9b9f54809bf05646e7979e5d6a428cb06c4e5e23d6deb5c8bc93338e4' 
  AND token = '6jm79sbPlnOljo7QDJYatyK3Lcb33b1H3MaG8cM+YSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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