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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8386bb189f133d5b560c060c84ec95946342b049695de70a04b525f31ce34f' 
  AND token = '3NOf48PeVljK1YgLrV0fcZ4QLHO2y4gntqC5+F/gysE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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