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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b07611f2734e28e05359379767bf4018d572c66f47b92e8d26894a3c1144393' 
  AND token = 'koy+7N/wI4FCUHqTTaDvptPKif4grrk7NiJh2n5/oUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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