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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36814a3b943aa861eca6b166b8379d73a4a36cd5ac2673bf2bffbc0b8ef6439' 
  AND token = 'TkXSGlZeOTf9dM1wxLxGPhNuySW0RbV5o+7zqT4IiO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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