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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638ebc17c37d9f3be62f55dd34594cab34c9229acb4f12ae6dbc9e81d85617b4' 
  AND token = '4USDlCy0QSL1CLd0kEjeL/WOTDQf0wmV9Roz/S2p4vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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