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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac74ef2b44e066c13c59b877732283e50c2c43abff8ecd59d171ad3a5fa82d5d' 
  AND token = '7zaEceFn+Jg0nLch42W9N+YwecwaB9LQjVu3km9oUdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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