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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84736f4e461e79569df890acfb04080a4f866910cc42e47844678acebb0faa40' 
  AND token = 'NZeOfV4gV2UOVscRn86vULLMegbvqG5BLoFsu3Z0TAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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