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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1ef83ae89f6048ccf8bf3c60ad471afc4c369a91671cdcd8e57c61055f8e49' 
  AND token = 'OM+5OJiezS+l5blVg7e1pNsrmyWtb5TkRGaF3Outb+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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