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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac5276186d16fd1bff3257d7950bdc06df957cf62b07558859e5a5c8bc689f3' 
  AND token = 't/E9Wx4S2ufrRGz5iQd2Xx3Fi8Nc88W9G88Q7d6Vkjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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