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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1985f6bf8a4c7e1e1c6dd1ad4028670b5ba8c74a7fec9c19b72515686451f363' 
  AND token = 'hA1xmaFuZshBSScWxwtP4cwG02qb2JIq09YaGc5jbUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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