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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04567975d6a408d58ed89bf6387ad91520ab72e49864081e505b6f84f5896a6a' 
  AND token = '7aGC5nsyFL7n4oRIqVuPyXqbs4c/xPa8+WoiuS8vKJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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