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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24054e766e9054c2ce3a9a7e554308e3e7f2ccb77b145607467dd16127b91297' 
  AND token = 'yLDgP2otFWyz38c2r8FR6ywdo/SaPUOVt8euimbZclU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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