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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6882766a46d243f66cec4a6bff9aecbc3fbeda3c435437aad2dce3d5e22038fd' 
  AND token = '3L5Q9hMXlHtZJaqOI5/2v+pJcJjs0Fuvu6PG94tcpys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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