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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686a78eb3d307037304c28c71f7f7dd68bec291408c6e1c99a25dcf7affb9437' 
  AND token = 'Jp9dh8idtb5ES7OTcKtGKmu/wdINUfXrDebUbM+YSpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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