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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4624605cc4ba5ab9b78063c05f4500528467f9f9838b82ced9457cee98906ece' 
  AND token = '3TTw4nMunlMIlgb8yB6GP3uZ398r6r8zP8J1hsCt68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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