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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236ea39fb788962cba4091be660b62ea2a2fc0d109913eb6c7fcb8b03a055276' 
  AND token = '/sM9ob5Jhz+tPC/j2P54YnwuYTfO6QQiyvzQcK03osA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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