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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dec62f142e0ec269b904a99a3f558ee0dd7dd59373e67f4e0ea9a8b7c58a952' 
  AND token = '8WMxpa9sFsGHbswUavDicJscj+8vrWbCcQcwhTmXrOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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