SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2d7a6f2cb826c4113fae85619addfc3c25ee81c71c1fa35434c377f884155d' 
  AND token = 'glXA4hcJCv/FsG+KhjLzIA3DH2y/u7ATwbXMkqiGWuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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