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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95382580cf538130bf11ef2bdb9904b602479e57a56d23de3acc6bc272e5b236' 
  AND token = '/S8DNUjgTn2cDBcWORo4FYqCY16GWlcNYkZ4gMyGmD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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