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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84241f53108f2ecfcf84c10793d87f10a86ba1664437e13973aff80af80f3386' 
  AND token = 'xtff+P6eIbKFrnNeDQr7V/oL8FUvPDeAvu+BU4qCS1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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