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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814ca8e528124eb8494864b19cb39fa2367536be61eebff46b448190459b7604' 
  AND token = 'ekokXre+QjEe0qX0guLXnA5mQUSxZNKpeNvoWT0JqZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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